CaO-based CO₂ sorbents effectively stabilized by metal oxides

The sorbents synthesized feature compositional homogeneity in combination with a nanostructured and highly porous morphology. When Al₂O₃ and Y₂O₃ were introduced together as stabilizers, a synergistic effect was observed whereby the bimetal oxide-stabilized sorbent featured an improved performance as compared to the sorbent stabilized by the same quantity of the single metal oxides of Al₂O₃ or Y₂O₃. The formation of a YAG phase between Al₂O₃ and Y₂O₃ leads to a sorbent with a higher fraction of CO₂-capture-active CaO, since some Al₂O₃ reacted with Y₂O₃ and not with CaO.